Method of manufacturing a substance resembling india-rubber.



Patented December 15, 1903.

PATENT OFFICE.

DANIEL HENRI DUPONT-FRANKLIN, OF NEW YORK, N. Y.

METHOD OF MANUFACTURING A SUBSTANCE RESEMBLING INDIA-RUBBER.

SPECIFICATION forming part of Letters Patent No. 746,689, dated December 15, 1903. Application filed May 18, 1903. Serial No- 156,983 (No specimens.)

To a, whom it may concern:

Be it known that I, DANIEL HENRI DUPONT- FRANKLIN, a citizen of the French Republic, residingin the city, county, and State of New York, have invented a certain new and useful Method of Mann factoring a Substance Resembling India-Rubber, of which the following is a full; clear, and exact specification.

In general terms my invention consists in combining a hydrocarbon and a suitable acid, boiling the mixture so formed, and feeding oxygen thereto.

As a specific example of my invention I may take one hundred parts of a hydrocarbon-such, for instance, as coal-tar-and mix it with twenty-five parts of an acid, such as boracic acid dissolved in alcohol, and boil the mixture a proper length of time and then introduce the same into avessel heatedto about 60 centigrade into which oxygen is introduced.

As it is necessary to know when the mixture of hydrocarbon (coal-tar) and acid (boracic acid) has been sufliciently boiled, the vapors which arise during the boiling are ignited and the boiling is permitted to continue until a green flame appears, such green flame being the signal that the mixture has been' sufficiently boiled.

It is understood that my invention is not limited to the mixture of coal-tar and boracic acid, but that coal-tar may be replaced by tar of petroleum or other hydrocarbons and that the boracic acid may be replaced by phosphoric or hydriodic or other acids.

' What I claim as new, and desire to secure by Letters Patent, is

The herein-described process of manufacturing a substance resembling india-rubber which consists in mixing together coal-tar and boracic acid dissolved in alcohol, boiling said mixture and supplying oxygen thereto, substantially as described.

In witness whereof Ihave hereunto set my hand, in presence of two witnesses, at New York, this 12th day of May, 1903.

. DANIEL HENRI DUPONT-FRANKLIN.

In presence of- ALFRED L. WEISSENTHANNY, OTTO MUNK. 

